%O cited By 2
%J International Journal of GEOMATE
%L scholars12149
%D 2019
%R 10.21660/2019.54.8315
%N 54
%X In rock mechanics, measurement of small strain response is the most basic and significant means of assessing rock mechanical and elasticity behavior. To overcome the difficulties of mounting, handling many cables, dependency of the stain responds measured to the properties of the sensor components, this paper intends to explore the applicability of a novel multi-channel Fiber Bragg Grating sensors (MC-FBGs) for determining small strain response of cylindrical rock specimen under uniaxial compression test for assessing deformability properties. The concept, design and embedment technique of MC-FBGs employed in the experiment are illustrated concisely. To analyze the stress-strain respond of a cylindrical limestone specimen, two axial FBGs placed diametrically opposite to each other along the longitudinal axis of the specimen and two radial FBGs embedded opposite to each other circumferentially within the central one-third portion of the specimen were adopted for axial and radial strain response measurement. In addition, two electrical resistancebased strain gauges (SG), one mounted axially and the other attached radially along the circumference, are used for comparative measurements with the FBGs. The values of unconfined compressive strength, Young's modulus, crack initiation and crack damage stress obtained from MC-FBGs and SG are in good agreement. It could be deduced that MC-FBGs can measure small strain response of limestone, stiffness anisotropy as well as measure the vital stages of rock failure mechanisms proficiently. MC-FBGs could serve as an alternative approach for determining reliable, accurate and precise compressive strain response of a limestone. © Int. J. of GEOMATE. All rights reserved, including the making of copies unless permission is obtained from the copyright proprietors
%P 158-163
%T Multi-Channel Fibre Bragg Grating Sensors For Uniaxial Compression Test On Limestone Elasticity Behaviour
%I GEOMATE International Society
%A B.W. Isah
%A H. Mohamad
%A N.R. Ahmad
%V 16